ON-BOARD SENSOR CLEANING DEVICE
An on-board sensor cleaning device includes a nozzle including one or more ejection ports that eject a fluid onto a sensing surface of an on-board sensor; wherein an ejection duration or an ejection frequency of the fluid, which is ejected onto the sensing surface, differs in accordance with a position on the sensing surface.
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The present application claims priority from Japanese Patent Application No. 2017-228134 filed on Nov. 28, 2017, the entire contents of which are incorporated by reference herein.
TECHNICAL FIELDThe present disclosure relates to an on-board sensor cleaning device.
BACKGROUND ARTA known on-board sensor cleaning device ejects a fluid onto the front surface of an optical surface (sensing surface) of an on-vehicle sensor to remove foreign material from the optical surface (for example, refer to Patent Document 1).
The on-board sensor cleaning device ejects a fluid (liquid in Patent Document 1) onto the optical surface while moving a nozzle, which is opposed to the optical surface, along the optical surface.
PRIOR ART DOCUMENT Patent DocumentPatent Document 1: European Patent Application Publication No. 3141441
SUMMARY OF THE INVENTIONThe above-described on-board sensor cleaning device is configured to eject a fluid from the nozzle while moving the nozzle back and forth along the optical surface. This allows the fluid to be evenly ejected onto the optical surface. However, since the fluid is evenly ejected onto the entire optical surface, a large amount of the fluid is used for a single action.
It is an object of the present invention to provide an on-board sensor cleaning device that reduces the ejected amount of a fluid.
An on-board sensor cleaning in accordance with one mode of the present disclosure includes a nozzle including one or more ejection ports that eject a fluid onto a sensing surface of an on-board sensor. An ejection duration or an ejection frequency of the fluid, which is ejected onto the sensing surface, differs in accordance with a position on the sensing surface.
In the above mode, the ejection duration or the ejection frequency of the fluid ejected onto the sensing surface differs in accordance with a position on the sensing surface. Therefore, the ejection duration or the ejection frequency of the fluid can be changed, for example, in correspondence with the distance from the nozzle or the level of ejection priority. This reduces the ejected amount of the fluid.
A first embodiment of a sensor system including an on-board sensor cleaning device will now be described.
As shown in
The on-board optical sensor 10 (e.g. LIDAR) is configured to radiate (emit), for example, an infrared laser beam and receive scattered light reflected by an object so as to measure the distance to the object. The on-board optical sensor 10 includes the optical surface 11 serving as a sensing surface that allows for transmission of a laser beam. In the following description, the side toward which the optical surface 11 is faced will be referred to as the front, and the opposite side will be referred to as the rear. Further, unless particularly indicated, the direction in which the on-board sensor cleaning device 20 is arranged on the on-board will be referred to as the top-bottom direction or vertical direction, and the direction orthogonal to the top-bottom direction and a front-rear direction will be referred to as the sideward direction.
The optical surface 11 is bulged toward the front and curved as viewed in the top-bottom direction.
As shown in
As shown in
As shown in
As shown in
As shown in
The nozzle 24 is entirely located above the on-board optical sensor 10 (optical surface 11) so that the nozzle 24 does not oppose the optical surface 11.
Further, the nozzle 24 includes passage P2 extending through the cylindrical portion 31 and the main body 32. The rear of the cylindrical portion 31 is located opposing the front of the connecting portion 25 so that the passage P1 in the connecting portion 25 is connected to the passage P2 in the nozzle 24. Thus, the air (gas) supplied from the pump 22 passes through the passage P1 in the connecting portion 25 and the passage P2 in the nozzle 24 and is ejected from the ejection port 32a of the main body 32 in the nozzle 24. Here, the passage P2 in the nozzle 24 is configured to be bent in the main body 32 and substantially L-shaped so that the ejection port 32a is directed downward in the vertical direction.
An annular seal member S2 is arranged at the rear end of the cylindrical portion 31, to seal a gap between the cylindrical portion 31 and the socket 23a. A seal member S3 is arranged at the front side of the cylindrical portion 31 to seal a gap between the cylindrical portion 31 and the socket 23b. This prevents water or the like from entering the gaps between the cylindrical portion 31 and each of the sockets 23a and 23b.
As shown in
As shown in
The first gear 43, which engages with the worm 41b, includes the worm wheel 43a and a spur gear (not shown) that is formed integrally with the worm wheel 43a and rotated coaxially with the worm wheel 43a. The spur gear (not shown) is engaged with a spur gear 44a of the second gear 44. The second gear 44 includes the spur gear 44a and a worm 44b that is configured integrally with the spur gear 44a and rotated coaxially with the spur gear 44a. The worm 44b mates with the worm wheel 31a formed on an outer circumferential surface of the cylindrical portion 31 of the nozzle 24. Thus, the reduction gear mechanism 42 transmits the rotational driving force of the motor 41 to the cylindrical portion 31 of the nozzle 24 so that the rotation speed is low and the torque is high. This pivots the cylindrical portion 31 and the main body 32, which is integrated with the cylindrical portion 31, and changes the direction in which the ejection port 32a is directed. In this case, the nozzle 24 is pivoted back and forth at a substantially constant speed in a predetermined range H on the optical surface 11 (refer to
Moreover, guide walls are arranged in a pivot direction of the nozzle 24 at two sideward ends of the nozzle 24. The guide walls 51 are continuous with the optical surface 11. Each guide wall 51 includes a curved front surface having substantially the same curvature as the optical surface 11. The guide wall 51 is configured to be narrowed as it becomes farther from the nozzle 24, and the front surface of the guide wall 51 is substantially triangular. The guide wall 51 is configured so that a lower end is parallel to the upper edge of the optical surface 11 and located at substantially the same position as the nozzle 24 in the vertical direction. Further, in the vicinity of the nozzle 24, the guide walls 51 have a height in the vertical direction that is substantially equivalent to the radius of the main body 32 of the nozzle 24.
A nozzle cover 52 is provided in front of the nozzle 24 to cover the nozzle 24 and limit exposure of the nozzle 24 to the outside. The nozzle cover 52 is attached to the case 23 by screws. The nozzle cover 52 may be attached through other means such as snap-fitting. The nozzle cover 52 is configured so that, for example, a front cover portion 52a that covers the nozzle 24 is curved at substantially the same curvature as the optical surface 11. Accordingly, the distance between the front cover portion 52a and the optical surface 11 in a direction orthogonal to the optical surface 11 is substantially constant over the entire front cover portion 52a and the optical surface 11 in a circumferential direction (curvature direction).
The on-board sensor cleaning device 20 of the present embodiment includes a controller CU that controls and drives the motor 41. The controller CU controls a rotation speed of the motor 41 to change an ejection duration of a fluid ejected onto the optical surface 11 in accordance with a position on the optical surface 11.
As shown in
As shown in
The controller CU controls the motor 41 as described above to set the ejection duration of fluid per unit area is set to be longer in the important region Ar1 than in the regular region Ar2.
The operation of the on-board sensor cleaning device 20 will now be described.
The nozzle unit 21 of the on-board sensor cleaning device 20 in the present embodiment is located at the upper side of the on-board optical sensor 10 in the vertical direction. When the pump 22 is driven, the air supplied from the pump 22 passes through the passages P1 and P2 and is continuously ejected from the ejection port 32a of the nozzle 24.
Further, the on-board sensor cleaning device 20 of the present embodiment is configured so that when the motor 41 is rotated and driven, rotational driving force, which is transmitted by the reduction gear mechanism 42 to the nozzle 24, pivots the nozzle 24. The forward and rearward rotation of the motor 41 pivots the ejection axis SL of the nozzle 24 back and forth on the optical surface 11.
In the on-board sensor cleaning device 20 of the present embodiment, the nozzle 24 is separated (toward upper side in vertical direction) from a position opposing the optical surface 11. Thus, the nozzle 24 will not be located on the optical surface 11 even when the nozzle 24 is pivoted to change the position of the ejection axis SL. This limits adverse effects on the sensing performance of the on-board sensor cleaning device 20.
Further, in the on-board sensor cleaning device 20 of the present embodiment, the controller CU controls the rotation speed of the motor 41 at which the nozzle 24 is pivoted. The controller CU controls the rotation speed of the motor 41 (rotation speed of nozzle 24) so that the maximum rotation speed of the motor 41 (maximum rotation speed of nozzle 24) is lower when the ejection axis SL is located in the important region Ar1 than when the ejection axis SL is located in the regular region Ar2. Thus, the rotation speed of the motor 41 (rotation speed of nozzle 24) is set to be relatively low in the important region Ar1 so as to increase a supply amount of the fluid per unit area in the important region Ar1. This reduces unnecessary ejection of the fluid.
The advantages of the present embodiment will now be described.
(1) The ejection duration of the fluid ejected onto the optical surface 11 is varied in accordance with a position on the optical surface 11 so that the ejection duration of the fluid can be changed in correspondence with, for example, the ejection priority on the optical surface 11. This reduces the ejected amount of the fluid.
(2) The ejection duration of fluid per unit area in the important region Ar1 where the ejection priority is high is set to be longer than that in the regular region Ar2 so that a greater amount of fluid is ejected to a portion that is more essential (important) than other portions. This reduces unnecessary ejection of the fluid.
(3) The important region Ar1 is set at the central portion of the optical surface 11 so that a greater amount of fluid is ejected to the central portion of the optical surface 11 than the non-central portions of the optical surface 11.
(4) The important region Ar1 includes the transmission range At through which light emitted from a light emitter of the on-board optical sensor 10 is transmitted through in the optical surface 11. This will reduce an amount of foreign material on the optical surface 11 that obstructs light emitted from the light emitter.
(5) The ejected amount of fluid can be reduced even when the employed nozzle 24 moves the ejection port 32a to change the ejection axis SL of the ejection port 32a.
(6) The ejected amount of fluid can be reduced in a structure in which the fluid is a gas.
Second EmbodimentAn on-board sensor cleaning device of a second embodiment will now be described with related with
As shown in
As shown in
As shown in
The guide rails 64a and 64b are arranged along the optical surface 11 of the on-board optical sensor 10. The guide rails 64a and 64b are spaced part from each other in a top-bottom direction, and two sideward ends of the guide rails 64a and 64b are supported by the case 63.
The drive unit 67 includes a motor 68 and a reduction gear mechanism 69. The reduction gear 69 includes a worm 70 and a first gear 71. The motor 68 includes an output shaft 68a on which the worm 70 is arranged. The first gear 71 includes a worm wheel 71a engaged with the worm 70. The first gear 71 includes a small diameter gear 71b that rotates coaxially with the worm wheel 71a. The small diameter gear 71b mates with a gear (not shown) that rotates coaxially with a drum pulley 65a. Thus, when the output shaft 68a of the motor 68 is driven and rotated, rotational driving force is transmitted to the drum pulley 65a thereby rotating the drum pulley 65a.
The pulleys 65a to 65e include the drum pulley 65a, guide pulleys 65b and 65c, and two tension pulleys 65d and 65e. The drum pulley 65a is configured to draw and send out the wire 66 when rotated. The guide pulleys 65b and 65c are respectively located at opposite sides of the drum pulley 65a in the sideward direction. The tension pulleys 65d and 65e are respectively located between the drum pulley 65a and the guide pulley 65b and between the drum pulley 65a and the guide pulley 65c to apply appropriate tension to the wire 66 so that the wire 66 to limit slack.
The wire 66 is configured to be connected to the nozzle 61. Thus, for example, when the drum pulley 65a is rotated, the wire 66 is drawn by the drum pulley 65a from one end in the sideward direction and sent out from the other end in the sideward direction to move the wire 66 in the sideward direction. This slides the nozzle 61 along the guide rails 64a and 64b. Further, the wire 66 is located between the guide rails 64a and 64b in the vertical direction. This moves the wire 66 and stably moves the nozzle 61 along the guide rails 64a and 64b.
As shown in
Further, the on-board sensor cleaning device 60 slides the nozzle 61 along the guide rails 64a and 64b of the slide mechanism 62 and drives the pump 22 to eject fluid (air) from the ejection port 61b of the nozzle 61. This allows fluid to be ejected over a wide range of the optical surface 11.
In the present example, the important region Ar1 having a high ejection priority is set in advance at each of the two sideward ends of the optical surface 11, and the regular region Ar2 having a low ejection priority is set in advance at a central portion of the optical surface 11. Further, in the present example, the important region Ar1 and the regular region Ar2 are rectangular.
As shown in
The controller CU controls the motor 68 as described above to set the ejection duration of fluid per unit area to be longer in the important region Ar1 than the regular region Ar2.
The on-board sensor cleaning device 60 has advantages (1), (2), and (6) of the first embodiment.
Third EmbodimentAn on-board sensor cleaning device of a third embodiment will now be described with reference to
As shown in
The ejection ports 82a to 82i are arranged in substantially equal intervals in a sideward direction. The ejection ports 82a to 82i are configured to eject the same amount of the air in each ejection.
In the present example, the important region Ar1 having a relatively high ejection priority is set in advance at a central portion of the optical surface 11 in the sideward direction, and the regular region Ar2 having a relatively low ejection priority is set in advance at each of the two sideward ends of the optical surface 11. In other words, the regular region Ar2 is set at each of left and right sides of the important region Ar1. Further, in the present example, the important region Ar1 and the regular region Ar2 are rectangular.
The important region Ar1 has substantially the same area as the regular region Ar2. That is, the area of the important region Ar1 is substantially one-half of the sum of the areas of each regular region Ar2.
The ejection axes SL of the three ejection ports 82a, 82b, and 82c are set in one regular region Ar2. The ejection axes SL of the three ejection ports 82g, 82h, and 82i are set in the other regular region Ar2. The ejection axes SL of the three ejection ports 82d, 82e, and 82f are set in the important region Ar1.
The controller CU controls, for example, a passage switching means (for example, valve) to control the ejection time at which the ejection ports 82a to 82i eject air. In the present example, the controller CU controls the passage switching means so that, for example, the ejection ports 82a to 82i sequentially perform ejection.
As shown in
The on-board sensor cleaning device 80 has following advantage in addition to advantages (1) to (4) and (6) of the first embodiment.
(7) Among the ejection ports 82a to 82i of the fixed nozzle 81, the ejection ports 82d, 82e, and 82f, which have the ejection axes SL set in the important region Ar1, have prolonged fluid ejection durations. This allows the fixed nozzle 81 to eject a greater amount of fluid onto the important region Ar1 than the regular regions Ar2. This reduces unnecessary ejection of fluid.
The above embodiments may be modified as described below.
In the first and second embodiments, the nozzle 24 and 61 respectively include the ejection ports 32a and 61b. However, there is no limitation to such a structure.
As shown in
The first embodiment includes one nozzle 24 as a movable nozzle. However, there is no limitation to such a structure.
As shown in
In the third embodiment, nine ejection ports 82a to 82i are arranged in the single nozzle 81. However, there is no limitation to such a structure, and changes can be made to the structure.
In the third embodiment, the area of the important region Ar1 is set to have substantially the same area as the regular region Ar2 located at each of left and right sides of the important region Ar1 in the sideward direction, and the three regions each have the same number of ejection axes SL of the ejection ports 82a to 82i. However, there is no limitation to such a structure.
As shown in
As shown in
In the third embodiment, the ejection ports 82a to 82i sequentially eject fluid one at a time, but more than two ejection ports can simultaneously eject fluid.
In the above embodiments, the ejected amount of fluid per unit area is varied by changing the ejection duration of the fluid. However, there is no limitation to such a configuration. The ejected amount of fluid per unit area may be varied by changing an ejection frequency. An example in which the ejection frequency is changed in the third embodiment will now be described.
As shown in
In the above embodiments, the ejected amount of fluid per unit area differs between the important region Ar1 and the regular region Ar2. That is, the ejected amount of fluid per unit area is varied in accordance with the ejection priority. However, there is no limitation to such a configuration. The ejection duration or the ejection frequency may be varied based on the distance to the optical surface 11 relative to the direction in which the ejection axis SL extends. One such example will now be described with reference to
As shown in
In the above embodiments, the optical surface 11 serving as a sensing surface is curved. However, there is no limitation to such a structure. The optical surface 11 may be, for example, flat.
In the above embodiments, the on-board sensor cleaning devices 20, 60, and 80 are arranged on the on-board optical sensor 10 in the vertical direction. However, the on-board sensor cleaning devices 20, 60, and 80 may be arranged next to each other or adjacent to each other in the sideward direction.
In the above embodiments, air is employed as a fluid. However, there is not limitation to such a configuration. A liquid or a gas other than air may be employed.
In the first embodiment, the passage P2, which is configured to draw in fluid (air), is arranged at the pivot center (center axis CL) of the nozzle 24. However, there is not limitation to such a structure. The passage P2 may be separated from the pivot center (center axis CL) of the nozzle 24.
The structure of the second embodiment includes the pulleys 65a to 65e and the wire 66, which runs along the pulleys 65a to 65e, as the slide mechanism 62. However, different structure may be employed as long as sliding along the optical surface 11 is allowed.
In the above embodiments, the on-board optical sensor 10 (e.g., LIDAR or camera), which is an optical sensor, is employed as an on-board sensor. However, there is no limitation to such a structure. An on-board sensor other than the on-board optical sensor 10 (for example, radar using radio wave (e.g., millimeter wave radar) or ultrasonic sensor used as corner sensor) may be employed.
Although not particularly described in the third embodiment, for example, a passage switching unit (passage switching means), which is described below, may be employed to switch the ejection ports. In the following example, the number of the ejection ports is four, and a passage switching unit functions as part of the pump 22. The passage switching unit described below is an example, and there is no limitation to such a structure.
As shown in
As shown in
The pump main body 110 includes a cylinder 111 and a piston 112. The piston 112 is accommodated in the cylinder 111 and moved back and forth by the driving force of the drive source (not shown). The piston 112 is connected to a transmission rod 113 that is directly or indirectly connected to the drive source. The transmission rod 113 transmits the driving force of the drive source and moves the piston 112 back and forth in an axial direction of the cylinder 111.
The cylinder 111 has an open end to which a cylinder end 114 is fixed. The cylinder end 114 includes a through hole 114a in a central portion, and a discharge port 114b is arranged in an end of the through hole 114a at the outer end side of the cylinder 111. A compression coil spring 123, which will be described later, biases a valve portion 122 toward the discharge port 114b. The valve portion 122 is formed integrally with a direct-acting member 121, which will be described later. The valve portion 122 includes a shaft 122a extending from the valve portion 122 through the through hole 114a (so that distal end projects into cylinder 111). A seal rubber 124 is fitted and attached on the shaft 122a at a side of the valve portion 122 opposing the discharge port 114b.
Thus, when the piston 112 is moved forth, the piston 112 biases the shaft 122a to open the valve portion 122 against the biasing force of the compression coil spring 123. This discharges the compressed air from the discharge port 114b of the pump main body 110.
As shown in
Further, in the present embodiment, part of the cylinder end 114 forms part of the passage switching unit 120.
Specifically, as shown in
Further, the case 125 includes a bottom 125a at the end opposite to the cylinder end 114. The bottom 125a includes first to fourth outlets B1 to B4 in substantially equal angular intervals (approximately 90°). Moreover, as shown in
As shown in
The direct-acting rotation member 126 includes a cylindrical portion 126a, an inward extension portion 126b, and a plurality of direct-acting rotation projections 126c. The cylindrical portion 126a has a smaller diameter than the cylindrical portion 121b of the direct-acting member 121. The inward extension portion 126b extends from the proximal end of the cylindrical portion 126a (side of discharge port 114b) inward in the radial direction (refer to
The direct-acting rotation member 126 is arranged so that the proximal end of the cylindrical portion 126a is accommodated in the cylindrical portion 121b of the direct-acting member 121 and that the direct-acting rotation projections 126c are configured to contact the inclination surfaces 114e of the fixed projections 114d and the inclination surfaces 121d of the direct-acting projections 121c in the axial direction. Further, the direct-acting rotation projections 126c are configured to be located between the fixed projections 114d in the circumferential direction in a state in which the direct-acting rotation member 126 is positioned at the side of the discharge port 114b. In this state, only linear movement of the direct-acting rotation member 126 is allowed. In a state in which the direct-acting rotation member 126 is positioned at the side opposite to the discharge port 114b, rotational movement of the direct-acting rotation member 126 is also allowed.
The rotation switching member 127 includes an accommodation cylindrical portion 127a and a disk portion 127b. The accommodation cylindrical portion 127a is configured to accommodate the distal end of the direct-acting rotation member 126. The disk portion 127b extends from the distal end of the accommodation cylindrical portion 127a inward in the radial direction and opposes the bottom 125a of the case 125 in the axial direction. Further, the accommodation cylindrical portion 127a includes an inner surface where a plurality of projections 127c are formed to engage with the direct-acting rotation projections 126c in the circumferential direction (refer to
Specifically, as shown in
An example of the operation of the above structure will now be described.
First, when the piston 112 is at a bottom dead center (farthest location from cylinder end 114), the direct-acting member 121 is located at the side of the cylinder end 114 and the discharge port 114b is closed by the valve portion 122.
Further, in this state as shown in
Next, when the piston 112 is moved forth, the air inside the cylinder 111 is compressed until the piston 112 contacts the shaft 122a of the direct-acting member 121.
Then, when the piston 112 is further moved forth, the piston 112 biases the shaft 122a so that the direct-acting member 121 including the valve portion 122 is linearly moved slightly toward the distal end (side of bottom 125a of case 125) against the biasing force of the compression coil spring 123. This opens the valve portion 122 and discharges the compressed air from the discharge port 114b. In this case, the air is ejected from, for example, the first outlet B1 that is located at the position coinciding with the connection hole 127d and connected with the discharge port 114b. Then, the air passes through a hose (not shown) and ejected from the first ejection port 101a (refer to
Subsequently, when forward movement of the piston 112 further moves the direct-acting member 121 (direct-acting projections 121c) linearly toward the distal end, as shown in
When the forward movement of the piston 112 further moves the direct-acting member 121 (direct-acting projection 121c) linearly, as shown in
Accordingly, as shown in
Then, as shown in
Subsequently, as shown in
By repeating the above-described operation, air is sequentially ejected from the ejection ports 101a to 101d.
In the above modified example, the number of outlets B1 to B4 and the ejection ports 101a to 101d are the same. However, there is no limitation to such a structure. For example, the number of the outlets may be greater than that of the ejection ports.
As shown in
As shown in
The four outlets B3 to B6 of the outlets B1 to B6 are respectively connected to (in communication with) the ejection ports 101b to 101e by a separate hose H1.
The outlets B1 and B2 of the outlets B1 to B6 are connected to the ejection port 101a. Specifically, the outlet B1 is connected to one end of hose H2, and the outlet B2 is connected to one end of hose H3 differing from the hose H2. Further, the other ends of the hoses H2 and H3, which are connected to the outlets B1 and B2, are respectively connected to a first connecting port J1 and a second connecting port J2 of a joint member J. The joint member J is a Y-shaped joint member including the first connecting port J1, the second connecting port J2, and a third connecting port J3. The third connecting port J3 of the joint member J is connected to one end of hose H3. The other end of the hose H3 is connected to the ejection port 101a.
In the above employed structure, when the pump 22 is driven, air is ejected twice from the ejection port 101a and then the air is separately ejected from the other ejection ports 101b to 101e one at a time. Specifically, the ejection frequency of the air ejected from the ejection port 101a, which is located at the central portion of the optical surface 11 in the sideward direction and of which the ejection axis SL is set in the important region Ar1, can be increased more than, for example, the ejection frequency of the air ejected from the other ejection ports 101d and 101e, of which the ejection axes SL are set in the regular region Ar2. This allows for cleaning with emphasis on the central portion (important region Ar1) where the priority is high in the optical surface 11.
The above embodiments and the modifications may be combined in any suitable manner.
Claims
1. An on-board sensor cleaning device, comprising:
- a nozzle including one or more ejection ports that eject a fluid onto a sensing surface of an on-board sensor;
- wherein an ejection duration or an ejection frequency of the fluid, which is ejected onto the sensing surface, differs in accordance with a position on the sensing surface.
2. The on-board sensor cleaning device according to claim 1, wherein
- the sensing surface includes an important region, which is where an ejection priority is high, and a regular region, where the priority is lower than the important region, and
- the ejection duration of fluid per unit area is longer or the ejection frequency is higher in the important region than the regular region.
3. The on-board sensor cleaning device according to claim 2, wherein the important region is set at a central portion of the sensing surface.
4. The on-board sensor cleaning device according to claim 2, wherein the important region is a region that includes a transmission range through which light emitted from a light emitter of the on-board sensor is transmitted.
5. The on-board sensor cleaning device according to claim 1, wherein the nozzle is a movable nozzle that moves the ejection port to change a position of an ejection axis of the ejection port.
6. The on-board sensor cleaning device according to claim 2, wherein
- the nozzle is a movable nozzle that moves the ejection port to change a position of an ejection axis of the ejection port,
- the movable nozzle is at least one of movable nozzles, and
- the ejection axis of each of the movable nozzles is configured to be set in the important region.
7. The on-board sensor cleaning device according to claim 2, wherein
- the nozzle is a fixed nozzle that includes ejection ports located along the sensing surface, and
- fluid ejected from the ejection port of which an ejection axis is set in the important region has a longer ejection duration per unit area or a higher ejection frequency than fluid ejected from the ejection port of which the ejection axis is set in the regular region.
8. The on-board sensor cleaning device according to claim 2, wherein
- the nozzle is a fixed nozzle that includes ejection ports located along the sensing surface, and
- the fluid is sequentially ejected from the ejection ports, and
- a number of the ejection ports of which ejection axes are set in the important region is greater than a number of the ejection ports of which the ejection axes are set in the regular region.
9. The on-board sensor cleaning device according to claim 2, wherein
- the nozzle is a fixed nozzle that includes ejection ports located along the sensing surface, and
- the fluid is sequentially ejected from the ejection ports, and
- an arrangement interval of the ejection ports of which ejection axes are set in the important region is narrower than an arrangement interval in which the ejection ports of which the ejection axes are set in the regular region.
10. The on-board sensor cleaning device according to claim 1, wherein the fluid is a gas.
Type: Application
Filed: Sep 27, 2018
Publication Date: Jul 30, 2020
Applicant: DENSO CORPORATION (Kariya-city, Aichi-pref.)
Inventor: Keita SAITO (Kariya-city)
Application Number: 16/652,552